Looking for some help with the rear heater system , on looking at the manual its unclear how the rear heater system works looking under the N/S it seems there is some sort of heater with a metal exhaust pipe the whole of the side is covered with plastic including the fuel tank i think it looks like a diesel heater but it has no switches other than one markedif rear on dash and roof controls to push heat from vents to rear vents in trim low down i was thinking this might be an aux heater if so how does it work in my T6 California i had a remote